Decorative extrusion



FIG. 1 is a front elevational view of the decorative extrusion showing my new design, wherein the back elevational view thereof is substantially identical thereto;

FIG. 2 is a right side elevational view thereof, wherein the left side elevational view thereof is substantially identical to the right side elevational view illustrated; and

FIG. 3 is a top plan view thereof; the bottom plan view being substantially identical thereto. 

The ornamental design for a decorative extrusion, as shown and described. 